yes, i know it, i a read several things about the subject, but again, there is not any valid proof, they are just speculations or even legends, like the italian mafias founded in 1300 we should say the same thing of italian mafias, because the origins of all this criminal groups are uncertain, so the italian mafia could be existed also in 1600 with another name, but are just speculations the only certian thing is that camorra and sicilian mafia were active at the beginning of 1800s (ndrangheta emerged at the ending of 1800) as i said yakuza was probably formed at the ending of 1800s, after all the yamaguchi-gumi, the most powerful yakuza clan was founded in 1913, yakuza is not a secretive criminal group so it's easy to know it, yakuza is not so old like somebody claim sema for triads, the black societies are not triads, the triads were fiunded by members of some black societies like the heaven and earth society, who started to be criminally involved and it happened only in 1800
The valid proof is that both Yakuza & Triad predates the Italy's mafia groups yet you rather call it unproven. The research into those 2 collectives continue to refer or pinpoint to a specific era which haven't changed. Therefore it's not a legend just like it's a general assessment that Italy's mafia groups started in early to mid 1800s. Furthermore , Yamaguchi-gumi was founded in 1915 and the oldest active yakuza group is the Aizukotetsu-kai in Kyoto which been around since the 1870s. I think your high interest in Italy's OC creates this weird bias towards other OC.
If you think you are too small to make a difference, you haven't spend the night with a mosquito. - African Proverb